In The Face-to-Face Book, Ed Keller and Brad Fay seek to expand the definition of “social marketing” to include websites like Facebook and Twitter along with face-to-face conversations and other forms of word-of-mouth communication. They review topics such as new research and understanding of how social influence helps determine consumers’ responses to advertisements, how to make a brand more “talkworthy,” and how engaging “influencers” can benefit a brand. They also discuss the often under-recognized role that social influence plays in determining the success of marketing and advertising of brands, products, services, and companies.